The region of the electromagnetic spectrum with wavelengths just greater than those in the infrared region is the ______________ region
a. microwaves
b. x-rays
c. gamma rays
d. radio waves
e. ultraviolet
a
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Based on the definition of apparent brightness, which units are appropriate for its measurement?
A) watts B) joules C) watts per square meter D) Newtons
Two wires A and B with circular cross sections are made of the same metal and have equal lengths, but the resistance of wire A is three times greater than that of wire B. What is the ratio of the radius of A to that of B?
1.3 2.?3 3.1 4.1/?3 5.1/3
An ice cube of mass 100 g and at 0°C is dropped into a Styrofoam cup containing 200 g of water at 25°C. (The latent heat of fusion of water is 80 cal/g and the specific heat capacity of water is 1.0 cal/g C°.) Assuming the cup does not exchange any heat with the outside, what will happen?
A. All of the ice will melt B. Nothing will happen C. All of the water will freeze D. Some of the ice will melt E. Some of the water will freeze
A circular coil of radius 5.0 cm and resistance 0.20 ? is placed in a uniform magnetic field perpendicular to the plane of the coil
The magnitude of the field changes with time according to B = 0.50e-20t T. What is the magnitude of the current induced in the coil at the time t = 2.0 s? A) 1.3 mA B) 9.2 mA C) 7.5 mA D) 4.2 mA E) 2.6 mA